From 67b45af946ec3148b64e6a3a1ee2ea8f79c5bc07 Mon Sep 17 00:00:00 2001
From: Like Xu <like.xu@linux.intel.com>
Date: Tue, 23 Feb 2021 09:39:57 +0800
Subject: [PATCH] KVM: vmx/pmu: Fix dummy check if lbr_desc->event is created
If lbr_desc->event is successfully created, the intel_pmu_create_
guest_lbr_event() will return 0, otherwise it will return -ENOENT,
and then jump to LBR msrs dummy handling.
Fixes: 1b5ac3226a1a ("KVM: vmx/pmu: Pass-through LBR msrs when the guest LBR event is ACTIVE")
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Message-Id: <20210223013958.1280444-1-like.xu@linux.intel.com>
[Add "< 0" and PTR_ERR to make the code clearer. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/vmx/pmu_intel.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index d1df618cb7deb..9efc1a6b86930 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -298,7 +298,7 @@ int intel_pmu_create_guest_lbr_event(struct kvm_vcpu *vcpu)
if (IS_ERR(event)) {
pr_debug_ratelimited("%s: failed %ld\n",
__func__, PTR_ERR(event));
- return -ENOENT;
+ return PTR_ERR(event);
}
lbr_desc->event = event;
pmu->event_count++;
@@ -320,7 +320,7 @@ static bool intel_pmu_handle_lbr_msrs_access(struct kvm_vcpu *vcpu,
if (!intel_pmu_is_valid_lbr_msr(vcpu, index))
return false;
- if (!lbr_desc->event && !intel_pmu_create_guest_lbr_event(vcpu))
+ if (!lbr_desc->event && intel_pmu_create_guest_lbr_event(vcpu) < 0)
goto dummy;
/*
--
2.30.2